Which houseguest downloaded the child porn?

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That’s the message from Sausalito police after they spent a lot of effort to find out who was accessing obscene material from a home.

The investigation began in September when officers were contacted by Novato police Detective Amy Yardley, who is a member of the Silicon Valley Internet Crimes Against Children Task Force, said Sausalito police Lt. Kurtis Skoog.

Yardley, working undercover, obtained child porn files from a user of a file-sharing website. She determined that the user had an IP address in Sausalito, Skoog said.

Sausalito police Detective Brian Mather served a search warrant at the home but didn’t find any child porn. Mystified, police grilled the residents, who were “cooperative and provided police with a list of houseguests who had access to their wireless connection,” Skoog said.

Mather was able to confirm, after a lengthy investigation, that one of the houseguests, 32-year-old Mark Magner of San Rafael, was responsible for downloading child porn at the home, Skoog said.

A search of Magner’s computer uncovered “multiple videos and pictures that depicted juveniles and children involved in sexual acts,” Skoog said.

Magner was arrested Tuesday on suspicion of possessing obscene matter involving children and booked at Marin County Jail.